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The Apache Web Server


Welcome to the History of Computing Podcast, where we explore the history of information technology. Because understanding the past prepares us for the innovations of the future! Today we’re going to cover one of the most important and widely distributed server platforms ever: The Apache Web Server. Today, Apache servers account for around 44% of the 1.7 Billion web sites on the Internet. But at one point it was zero. And this is crazy, it’s down from over 70% in 2010. Tim Berners-Lee had put the first website up in 1991 and what we now know as the web was slowly growing. In 1994 and begins with the National Center for Supercomputing Applications, University of Illinois, Urbana-Champaign. Yup, NCSA is also the organization that gave us telnet and Mosaic, the web browser that would evolve into Netscape. After Rob leaves NCSA, the HTTPdaemon goes a little, um, dormant in development. The distress had forked and the extensions and bug fixes needed to get merged into a common distribution. Apache is a free and open source web server that was initially created by Robert McCool and written in C in 1995, the same year Berners-Lee coined the term World Wide Web. You can’t make that name up. I’d always pictured him as a cheetah wearing sunglasses. Who knew that he’d build a tool that would host half of the web sites in the world. A tool that would go on to be built into plenty of computers so they can spin up sharing services. Times have changed since 1995. Originally the name was supposedly a cute name referring to a Patchy server, given that it was based on lots of existing patches of craptostic code from NCSA. So it was initially based on NCSA HTTPd is still alive and well all the way up to the configuration files. For example, on a Mac these are stored at /private/etc/apache2/httpd.conf. The original Apache group consisted of * Brian Behlendorf * Roy T. Fielding * Rob Hartill * David Robinson * Cliff Skolnick * Randy Terbush * Robert S. Thau * Andrew Wilson And there were additional contributions from Eric Hagberg, Frank Peters, and Nicolas Pioch. Within a year of that first shipping, Apache had become the most popular web server on the internet. The distributions and sites continued to grow to the point that they formed the Apache Software Foundation that would give financial, legal, and organizational support for Apache. They even started bringing other open source projects under that umbrella. Projects like Tomcat. And the distributions of Apache grew. Mod_ssl, which brought the first SSL functionality to Apache 1.17, was released in 1998. And it grew. The Apache Foundation came in 1999 to make sure the project outlived the participants and bring other tools under the umbrella. The first conference, ApacheCon came in 2000. Douglas Adams was there. I was not. There were 17 million web sites at the time. The number of web sites hosted on Apache servers continued to rise. Apache 2 was released in 2004. The number of web sites hosted on Apache servers continued to rise. By 2009, Apache was hosting over 100 million websites. By 2013 Apache had added that it was named “out of a respect for the Native American Indian tribe of Apache”. The history isn’t the only thing that was rewritten. Apache itself was rewritten and is now distributed as Apache 2.0. there were over 670 million web sites by then. And we hit 1 billion sites in 2014. I can’t help but wonder what percentage collections of fart jokes. Probably not nearly enough. But an estimated 75% are inactive sites. The job of a web server is to serve web pages on the internet. Those were initially flat HTML files but have gone on to include CGI, PHP, Python, Java, Javascript, and others. A web browser is then used to interpret those files. They access the .html or .htm (or other one of the other many file types that now exist) file and it opens a page and then loads the text, images, included files, and processes any scripts. Both use the http protocol; thus the URL begins with http or https if the site is being hosted over ssl. Apache is responsible for providing the access to those pages over that protocol. The way the scripts are interpreted is through Mods. These include mod_php, mod_python, mod_perl, etc. The modular nature of Apache makes it infinitely extensible. OK, maybe not infinitely. Nothing’s really infinite. But the Loadable Dynamic Modules do make the system more extensible. For example, you can easily get TLS/SSL using mod_ssl. The great thing about Apache and its mods are that anyone can adapt the server for generic uses and they allow you to get into some pretty really specific needs. And the server as well as each of those mods has its source code available on the Interwebs. So if it doesn’t do exactly what you want, you can conform the server to your specific needs. For example, if you wanna’ hate life, there’s a mod for FTP. Out of the box, Apache logs connections, includes a generic expression parser, supports webdav and cgi, can support Embedded Perl, PHP and Lua scripting, can be configured for public_html per-user web-page, supports htaccess to limit access to various directories as one of a few authorization access controls and allows for very in depth custom logging and log rotation. Those logs include things like the name and IP address of a host as well as geolocations. Can rewrite headers, URLs, and content. It’s also simple to enable proxies Apache, along with MySQL, PHP and Linux became so popular that the term LAMP was coined, short for those products. The prevalence allowed the web development community to build hundreds or thousands of tools on top of Apache through the 90s and 2000s, including popular Content Management Systems, or CMS for short, such as Wordpress, Mamba, and Joomla. * Auto-indexing and content negotiation * Reverse proxy with caching * Multiple load balancing mechanisms * Fault tolerance and Failover with automatic recovery * WebSocket, FastCGI, SCGI, AJP and uWSGI support with caching * Dynamic configuration * Name- and IP address-based virtual servers * gzip compression and decompression * Server Side Includes * User and Session tracking * Generic expression parser * Real-time status views * XML support Today we have several web servers to choose from. Engine-X, spelled Nginx, is a newer web server that was initially released in 2004. Apache uses a thread per connection and so can only process the number of threads available; by default 10,000 in Linux and macOS. NGINX doesn’t use threads so can scale differently, and is used by companies like AirBNB, Hulu, Netflix, and Pinterest. That 10,000 limit is easily controlled using concurrent connection limiting, request processing rate limiting, or bandwidth throttling. You can also scale with some serious load balancing and in-band health checks or with one of the many load balancing options. Having said that, Baidu.com, Apple.com, Adobe.com, and PayPal.com - all Apache. We also have other web servers provided by cloud services like Cloudflare and Google slowly increasing in popularity. Tomcat is another web server. But Tomcat is almost exclusively used to run various Java servers, servelets, EL, webscokets, etc. Today, each of the open source projects under the Apache Foundation has a Project Management committee. These provide direction and management of the projects. New members are added when someone who contributes a lot to the project get nominated to be a contributor and then a vote is held requiring unanimous support. Commits require three yes votes with no no votes. It’s all ridiculously efficient in a very open source hacker kinda’ way. The Apache server’s impact on the open-source software community has been profound. It iis partly explained by the unique license from the Apache Software Foundation. The license was in fact written to protect the creators of Apache while giving access to the source code for others to hack away at it. The Apache License 1.1 was approved in 2000 and removed the requirement to attribute the use of the license in advertisements of software. Version two of the license came in 2004, which made the license easier for projects that weren’t from the Apache Foundation. This made it easier for GPL compatibility, and using a reference for the whole project rather than attributing software in every file. The open source nature of Apache was critical to the growth of the web as we know it today. There were other projects to build web servers for sure. Heck, there were other protocols, like Gopher. But many died because of stringent licensing policies. Gopher did great until the University of Minnesota decided to charge for it. Then everyone realized it didn’t have nearly as good of graphics as other web servers. Today the web is one of the single largest growth engines of the global economy. And much of that is owed to Apache. So thanks Apache, for helping us to alleviate a little of the suffering of the human condition for all creatures of the world. By the way, did you know you can buy hamster wheels on the web. Or cat food. Or flea meds for the dog. Speaking of which, I better get back to my chores. Thanks for taking time out of your busy schedule to listen! You probably get to your chores as well though. Sorry if I got you in trouble. But hey, thanks for tuning in to another episode of the History of Computing Podcast. We’re lucky to have you. Have a great day!

Susan Kare, The Happy Mac, And The Trash Can


Susan Kare Welcome to the History of Computing Podcast, where we explore the history of information technology. Because by understanding the past, we’re able to be prepared for the innovations of the future! Today we’ll talk about a great innovator, Susan Kare. Can you imagine life without a Trash Can icon? What about the Mac if there had never been a happy Mac icon. What would writing documents be like if you always used Courier and didn’t have all those fonts named after cities? They didn’t just show up out of nowhere. And the originals were 8 bit. But they were were painstakingly designed, reviewed, reviewed again, argued over, obsessed over. Can you imagine arguing with Steve Jobs? He’s famous for being a hard person to deal with. But one person brought us all of these things. One pioneer. One wizard. She cast her spell over the world. And that spell was to bring to an arcane concept called the desktop metaphor into everyday computers. Primitive versions had shipped in Douglas Engelbart’s NLS, in Alan Kay’s Smalltalk. In Magic Desk on the Commodore 64. But her class was not an illusionist as those who came before her were, but a mage, putting hexadecimal text derived from graph paper so the bits would render on the screen the same, for decades to come. And we still use her visionary symbols, burned into the spell books of all visual designers from then to today. She was a true innovator. She sat in a room full of computer wizards that were the original Mac team, none was more important than Susan Kare. Born in 1954 in Ithaca, New York this wizard got her training in the form of a PhD from New York University and then moved off to San Francisco in the late 1970s, feeling the draw of a generation’s finest to spend her mage apprenticeship as a curator at a Fine Arts Museum. But like Gandalph, Raistlin, Dumbledoor, Merlin, Glinda the good witch and many others, she had a destiny to put a dent in the universe. To wield the spells of the infant user interface design art to reshape the universe, 8-bits at a time. She’d gone to high school with a different kind of wizard. His name was Andy Hertzfeld and he was working at a great temple called Apple Computer. And his new team team would build a new kind of computer called the Macintosh. They needed some graphics and fonts help. Susan had used an Apple II but had never done computer graphics. She had never even dabbled in typography. But then, Dr Strange took the mantle with no experience. She ended up taking the job and joining Apple as employee badge number 3978. She was one of two women on the original Macintosh team. She had done sculpture and some freelance work as a designer. But not this weird new art form. Almost no one had. Like any young magician, she bought some books and studied up on design, equating bitmap graphics to needlepoint. She would design the iconic fonts, the graphics for many of the applications, and the icons that went into the first Mac. She would conjure up the hex (that’s hexadecimal) for graphics and fonts. She would then manually type them in to design icons and fonts. Going through every letter of every font manually. Experimenting. Testing. At the time, fonts were reserved for high end marketing and industrial designers. Apple considered licensing existing fonts but decided to go their own route. She painstakingly created new fonts and gave them the names of towns along train stops around Philadelphia where she grew up. Steve Jobs went for the city approach but insisted they be cool cities. And so the Chicago, Monaco, New York, Cairo, Toronto, Venice, Geneva, and Los Angeles fonts were born - with her personally developing Geneva, Chicago, and Cairo. And she did it in 9 x 7. I can still remember the magic of sitting down at a computer with a graphical interface for the first time. I remember opening MacPaint and changing between the fonts, marveling at the typefaces. I’d certainly seen different fonts in books. But never had I made a document and been able to set my own typeface! Not only that they could be in italics, outline, and bold. Those were all her. And she painstakingly created them out of pixels. The love and care and detail in 8-bit had never been seen before. And she did it with a world class wizard: someone with a renowned attention to detail and design sense like Steve Jobs looking over her shoulder and pressuring her to keep making it better. They brought the desktop metaphor into the office. Some of it pre-existed her involvement. The trash can had been a part of the Lisa graphics already. She made it better. The documents icon pre-dated her. She added a hand holding a pencil to liven it up, making it clear which files were applications and which were documents. She made the painting brush icon for MacPaint that, while modernized, is still in use in practically every drawing app today. In fact when Bill Atkinson was writing MacSketch and saw her icon, the name was quickly changed to MacPaint. She also made the little tool that you use to draw shapes and remove them called the lasso, with Bill Atkinson. Before her, there were elevators to scroll around in a window. After her, they were called scroll bars. After her, the places you dropped your images was called the Scrapbook. After her the icon of a floppy disk meant save. She gave us the dreaded bomb. The stop watch. The hand you drag to move objects. The image of a speaker making sound. The command key, still on the keyboard of every Mac made. You can see that symbol on Nordic maps and it denotes an “area of interest” or more poignant for the need: “Interesting Feature”. To be clear, I never stole one of those signs while trampsing around Europe. But that symbol is a great example of what a scholarly mage can pull out of ancient tomes, as it is called a Gorgon knot or Saint John Arm’s and dates back over fifteen hundred years - and you can see that in other hieroglyphs she borrowed from obscure historical references. And almost as though those images are burned into our DNA, we identified with them. She worked with the traditionally acclaimed wizards of the Macintosh: Andy Hertzfeld, Bill Atkinson, Bruce Horn, Bud Tribble, Donn Denman, Jerome Coonen, Larry Kenos, and Steve Capps. She helped Chris Espinosa, Clement Mok, Ellen Romana, and Tom Hughes out with graphics for manuals, and often on how to talk about a feature. But there was always Steve Jobs. Some icons took hours; others took days. And Jobs would stroll in and have her recast her spell if it wasn’t just right. Never acknowledging the effort. If it wasn’t right, it wasn’t right. The further the team pushed on the constantly delayed release of the Mac the more frantic the wizards worked. The less they slept. But somehow they knew. It wasn’t just Jobs’ reality distortion field as Steven Levy famously phrased it. They knew that what they were building would put a dent in the Universe. And when they all look back, her designs on “Clarus the Dogcow” were just the beginning of her amazing contributions. The Mac launched. And it did not turn out to be a commercial success, leading to the ouster of Steve Jobs - Sauron’s eye was firmly upon him. Kare left with Jobs to become the tenth employee at NeXT computer. But she introduced Jobs to Paul Rand, who had helped design the IBM logo, to design their logo. When IBM, the Voldemort of the time, was designing OS/2, she helped with their graphics. When Bill Gates, the Jafar of the computer industry called, she designed the now classic solitaire for Windows. And she gave them Notepad and Control Panels. And her contributions have continued. When Facebook needed images for the virtual gifts feature. They called Kare. You know that spinning button when you refresh Pinterest. That’s Kare. And she still does work all the time. The Museum of Modern Art showed her original Sketches in a 2015 Exhibit called “This is for everyone.” She brought us every day metaphors to usher in the and ease the transition into a world of graphical user interfaces. Not a line of the original code remains. But it’s amazing how surrounded by all the young wizards, one that got very little attention in all the books and articles about the Mac was the biggest wizard of them all. Without her iconic designs, the other wizards would likely be forgotten. She is still building one of the best legacies in all of the technology industry. By simply putting users into user interface. When I transitioned from the Apple II to the Mac, she made it easy for me with those spot-on visual cues. And she did it in only 8 bits. She gave the Mac style and personality. She made it fun, but not so much fun that it would be perceived as a toy. She made the Mac smile. Who knew that computers could smile?!?! The Mac Finder still smiles at me every day. Truly Magical. Thanks for that, Susan Kare. And thanks to you inquisitive and amazing listeners. For my next trick. I’ll disappear. But thank you for tuning in to yet another episode of the History of Computing Podcast. We’re so lucky to have you. Have a great day!

(OldComputerPods) ©Sean Haas, 2020